How to be cool:
saying “thank you”;Apologizing when wrong;Showing up on time;Being nice to strangers;Listening without interrupting;Admitting you were wrong;Following your dreams; Being a mentor;Learing and remembering people’s names;Holings doors open;___Accroding to Warren Buffett Continue reading Maxim →

钢的热处理符号Ac、Ar、Acm中，c、r、cm分别表示的哪些单词缩写？加热的时候用c表示，calefaction，冷却的时候用r表示， refrigeration。cm=cementite 渗碳体.Acm是指二次渗碳体析出线（渗碳体在奥氏体中溶解度线）